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Ultra-hypofractionated Irradiation of the Whole Breast (WBI) Compared to Partial Breast Irradiation (PBI)

27 de setembro de 2026 atualizado por: Marko Bojovic, Oncology Institute of Vojvodina

Ultra-hypofractionated Radiotherapy for Whole Breast Irradiation (WBI) Compared to Partial Breast Irradiation (PBI): A Single-Institution Prospective Phase 2 Trial

Female patients undergoing surgical treatment for early breast cancer and meeting the inclusion criteria for adjuvant breast radiotherapy were randomized into two groups. One group will receive adjuvant whole-breast radiotherapy in ultra-hypofractionated regimen of 26 Gy in 5 fractions. In contrast, the other group will receive partial breast irradiation with a dose of 26Gy in 5 fractions.

The study's objective is to compare the effects of both breast radiotherapy protocols in terms of locoregional disease control and survival and to compare the adverse effects of radiotherapy between the two protocols. To determine if there is a correlation between different parameters and the efficacy and degree of toxicity for both protocols.

Visão geral do estudo

Status

Ativo, não recrutando

Condições

Intervenção / Tratamento

Descrição detalhada

Radiation therapy should ideally start 6-8 weeks after breast-conserving surgery but no later than 12 weeks after the surgery.

If adjuvant chemotherapy has been administered, it is recommended to start radiation therapy three weeks after chemotherapy (optionally, it can be completed before beginning chemotherapy).

The radiation therapy procedure follows the existing clinical protocol for breast radiotherapy. For radiation therapy planning, the patient is positioned supine using immobilization devices (such as a wing board or similar) to ensure daily reproducibility within a range of 5 mm. The clinical target volume (CTV) is delineated according to the recommendations of the Danish Breast Cancer Cooperative Group (DBCG) and the European Society for Radiotherapy and Oncology (ESTRO).

A total dose of 26Gy in 5 fractions every working day using the Volumetric Modulated Arc Therapy (VMAT) technique. Daily portal images are obtained, and a breathing control protocol is applied based on clinical assessment.

Tipo de estudo

Intervencional

Inscrição (Estimado)

106

Estágio

  • Fase 2

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Locais de estudo

    • Vojvodina
      • Novi Sad, Vojvodina, Sérvia, 21204
        • Oncology Institute of Vojvodina

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

50 anos e mais velhos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Fêmea

Descrição

Inclusion Criteria:

  • Breast-conserving surgery
  • Invasive ductal carcinoma
  • Age ≥ 50
  • Tumor size ≤ 3 cm
  • R0 resection
  • Unicentric/unifocal carcinoma or multifocal carcinoma within 2 cm of the primary neoplasm
  • pN0 (sentinel lymph node biopsy or axillary lymph node dissection performed), N1mi
  • Hormone receptor status - any
  • Histological grade G1 or G2

Exclusion Criteria:

  • Neoadjuvant systemic therapy
  • TNBC (triple-negative breast cancer)
  • Extensive intraductal component (EIC)
  • Lymphovascular invasion (LVI)
  • associated DCIS > 2.5 cm in size or high nuclear grade

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Nenhum (rótulo aberto)

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Comparador Ativo: Irradiação Parcial da Mama

The course of radiotherapy with 26Gy in 5 fractions will be administered to the part of the breast where the tumor was located.

Experimental: Irradiação da mama inteira

An ultra-short course of radiotherapy with 26Gy in 5 fractions will be administered to the whole breast where the tumor was located.

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Acute Radiation Toxicity
Prazo: From the start of radiotherapy up to 6 months.

Proportion of participants experiencing acute radiation toxicity, defined as toxicity occurring within 6 months of the start of radiotherapy, graded according to the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0. Toxicity types assessed include gastrointestinal, genitourinary, and skin toxicity.

From the start of radiotherapy up to 6 months.
Late Radiation Toxicity
Prazo: From 6 months after the start of radiotherapy up to 60 months.

Proportion of participants experiencing late radiation toxicity, defined as toxicity occurring more than 6 months after the start of radiotherapy, graded according to the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0. Toxicity types assessed include gastrointestinal, genitourinary, and skin toxicity.

From 6 months after the start of radiotherapy up to 60 months.

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Time to Local-Regional Recurrence
Prazo: From adjuvant radiotherapy until locoregional recurrence, assessed up to 10 years.

Time from adjuvant radiotherapy to the first occurrence of pathologically confirmed locoregional tumor recurrence, defined as any newly suspicious skin change(s) or palpable lymph node(s) in the irradiated area. Participants without locoregional recurrence are censored at the date of last follow-up.

From adjuvant radiotherapy until locoregional recurrence, assessed up to 10 years.
Disease-Free Survival (DFS)
Prazo: From adjuvant radiotherapy until disease recurrence, second primary tumor, or death from any cause, assessed up to 10 years.

Time from adjuvant radiotherapy to the first occurrence of clinically confirmed local recurrence, distant metastasis, second primary tumor, or death from any cause, whichever occurs first. Participants who are alive and disease-free at the time of analysis are censored at the date of last follow-up.

From adjuvant radiotherapy until disease recurrence, second primary tumor, or death from any cause, assessed up to 10 years.
Overall Survival (OS)
Prazo: From adjuvant radiotherapy until death from any cause, assessed up to 10 years.

Time from adjuvant radiotherapy to death from any cause. Participants who are alive at the time of analysis are censored at the date of last follow-up.

From adjuvant radiotherapy until death from any cause, assessed up to 10 years.
Time to Distant Metastasis
Prazo: From adjuvant radiotherapy until distant metastasis or death, assessed up to 10 years.

Time from adjuvant radiotherapy to the first occurrence of distant metastasis, confirmed by imaging or pathology. Participants without distant metastasis are censored at the date of last follow-up or death.

From adjuvant radiotherapy until distant metastasis or death, assessed up to 10 years.
Physician-reported Harvard Breast Cosmesis Scale
Prazo: Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.

Cosmesis assessed by the physician using the Harvard Breast Cosmesis Scale. This is a 4-point categorical scale: Excellent (treated breast nearly identical to the untreated breast), Good (slight difference between breasts), Fair (obvious difference between breasts but without major distortion), and Poor (marked distortion of the treated breast). Higher scores (Poor) indicate worse cosmesis. The physician completes the assessment independently.

Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.
Patient-reported Harvard Breast Cosmesis Scale
Prazo: Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.

Cosmesis assessed by the patient using the Harvard Breast Cosmesis Scale. This is a 4-point categorical scale: Excellent (treated breast nearly identical to the untreated breast), Good (slight difference between breasts), Fair (obvious difference between breasts but without major distortion), and Poor (marked distortion of the treated breast). Higher scores (Poor) indicate worse cosmesis. The patient completes the assessment independently.

Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.
Quality of Life - EORTC QLQ-C30 (Serbian version)
Prazo: Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.

The Serbian translation of the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30), validated for the Serbian-speaking population, will be used to assess quality of life. This questionnaire consists of 30 items grouped into functional scales, symptom scales, a global health status/QoL scale, and single-item symptom scales. Responses are converted to a 0 to 100 scale. For functional and global QoL scales, higher scores indicate better functioning/QoL. For symptom scales, higher scores indicate greater symptom severity.

Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.
Quality of Life - EORTC QLQ-BR23 (Serbian version)
Prazo: Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.

The Serbian translation of the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Breast Cancer Module (EORTC QLQ-BR23), validated for the Serbian-speaking population, will be used to assess breast cancer-specific quality of life. This 23-item module includes functional scales (body image, sexual functioning, sexual enjoyment, future perspective) and symptom scales (systemic therapy side effects, breast symptoms, arm symptoms, upset by hair loss). Scores are converted to a 0 to 100 scale. For functional scales, higher scores indicate better functioning. For symptom scales, higher scores indicate greater symptom severity.

Baseline; 1 month after the end of treatment; every 3 months for the first 2 years; every 6 months in years 4 and 5; and annually after year 5.

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

1 de junho de 2023

Conclusão Primária (Real)

1 de junho de 2026

Conclusão do estudo (Estimado)

1 de junho de 2036

Datas de inscrição no estudo

Enviado pela primeira vez

8 de junho de 2023

Enviado pela primeira vez que atendeu aos critérios de CQ

19 de junho de 2023

Primeira postagem (Real)

22 de junho de 2023

Atualizações de registro de estudo

Última Atualização Postada (Real)

29 de setembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

27 de setembro de 2026

Última verificação

1 de setembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • NS-dojka-SRB

Plano para dados de participantes individuais (IPD)

Planeja compartilhar dados de participantes individuais (IPD)?

SIM

Descrição do plano IPD

The analyzed data from the study will be published in scientific journals. We are prepared to share our data for analysis with researchers from similar studies (previously registered on ClinicalTrials.gov) to compare our results.

Prazo de Compartilhamento de IPD

The expected time for the publication of the first data is in 3 years (2026).

Critérios de acesso de compartilhamento IPD

Contact the researchers via email.

Tipo de informação de suporte de compartilhamento de IPD

  • PROTOCOLO DE ESTUDO
  • CIF
  • CSR

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Sim

produto fabricado e exportado dos EUA

Sim

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .